Loading order in .sty file

Question

With help from egreg, I have the following collection of packages and macros in the file standardopsaetning.sty:

\NeedsTeXFormat{LaTeX2e}[2014/05/01]
\ProvidesPackage{standardopsaetning}[2015/01/04 Standardopsætning]


\RequirePackage[utf8]{inputenc}
\RequirePackage[T1]{fontenc}
\RequirePackage{lmodern}
\RequirePackage{babel}
\RequirePackage[
  hmargin = 2.4cm,
  vmargin = 3cm
]{geometry}
\RequirePackage{mathtools}
\RequirePackage[
  bottom,
  hang,
  stable
]{footmisc}
\RequirePackage{fancyhdr}
\RequirePackage{caption}
\RequirePackage{siunitx}
\RequirePackage{pstricks-add}
\RequirePackage{booktabs}
\RequirePackage{enumitem}
\RequirePackage{upgreek}
\RequirePackage[
  lastpage
]{zref}
\RequirePackage{microtype}


\mathtoolsset{
  showonlyrefs
}
\DeclareCaptionLabelSeparator{tilpasning}{:\quad}
\captionsetup{
  labelsep = tilpasning,
  figureposition = bottom,
  tableposition = top,
  font = small,
  labelfont = sc
}
\sisetup{
  locale = DE,
  per-mode = symbol-or-fraction,
  range-phrase = --
}
\psset{
  dimen = m
}

\newif\ifprint
\newif\ifsubscript

\addto\extrasdanish{
  \renewcommand*\pageautorefname{side}
  \renewcommand*\figureautorefname{\textsc{Figur}}
  \renewcommand*\tableautorefname{\textsc{Tabel}}
}

\providecommand*\setfloatlocations[2]{\@namedef{fps@#1}{#2}}
\setfloatlocations{figure}{htbp}
\setfloatlocations{table}{htbp}

\DisableLigatures[f]{encoding = T1}

\setlength\footnotemargin{6pt}

\pagestyle{fancy}
\renewcommand*\headrulewidth{0pt}
\setlength\headheight{14.5pt}
\zref@newprop*{numpage}{\the\value{page}}
\zref@addprop{main}{numpage}
\fancyhf{}
\fancyfoot[C]{%
  \ifnum \zref@extractdefault{LastPage}{numpage}{0} > 1
    \thepage
  \fi
}

\begingroup\lccode`\~=`\_
\lowercase{\endgroup
  \protected\def~{\@ifnextchar|\subtextup\sb}%
}
\def\subtextup|#1|{\sb{\textup{#1}}}%
\AtBeginDocument{\catcode`\_=12 \mathcode`\_=\string"8000 }

\ExplSyntaxOn
\cs_new_eq:NN \calc \fp_eval:n

\NewDocumentCommand\SIexpr{ O{,} m m }
 {
  \SIextension_siexpr:nnn { #1 } { #2 } { #3 }
 }

\cs_new_protected:Npn \SIextension_siexpr:nnn #1 #2 #3
 {
  \seq_set_split:Nnn \l_SIextension_siexpr_input_seq { #1 } { #2 }
  \seq_pop_left:NN \l_SIextension_siexpr_input_seq \l_SIextension_siexpr_first_tl
  \seq_clear:N \l_SIextension_siexpr_output_seq
  \seq_put_right:Nx \l_SIextension_siexpr_output_seq
   {
    \fp_compare:nTF { \l_SIextension_siexpr_first_tl > 0 }
      { \num { \l_SIextension_siexpr_first_tl } }
      { - \num { \tl_tail:V \l_SIextension_siexpr_first_tl } }
   }
  \seq_map_inline:Nn \l_SIextension_siexpr_input_seq
   {
    \seq_put_right:Nx \l_SIextension_siexpr_output_seq
     {
      \fp_compare:nTF { ##1 > 0 }
        { + \num { ##1 } }
        { - \num { \tl_tail:n { ##1 } } }
     }
   }

  \SI[
    parse-numbers = false,
    quotient-mode = fraction,
    input-product = *,
    output-product = \cdot
  ]
   {
    \sisetup{parse-numbers}
    \left( \seq_use:Nn \l_SIextension_siexpr_output_seq { } \right)
   }
   { #3 }
}
\ExplSyntaxOff


\endinput

I then start a .tex file with the following:

\RequirePackage{fixltx2e}

\documentclass[
  a4paper,
  12pt,
  danish
]{article}

\usepackage{standardopsaetning}

...

Question: Is this 'correct' or is there a better loading order or should I change something else? (As an example, I'm not sure if lmodern is loaded in the best place.)