man magick

https://www.imagemagick.org/script/command-line-processing.php
https://www.imagemagick.org/Magick++/Image++.html

Consider m = 2 monitors with the resolutions:

"resolutions": [
	{
	  "width": 3840,
	  "height": 2160
	},
	{
	  "width": 3840,
	  "height": 2160
	}
]

Consider 26 figures or images, 13 for each monitor:

fig01.avif  
fig02.jpg
fig03.webp
...
fig25.png
fig26.svg

pictures_per_monitor = 13

Size occupied by each image:
3840 / 13 = 295
2160 / 13 = 166

Remainders:
3840 % 13 = 5
2160 % 13 = 2



Example 1: equal resolutions, vertical + horizontal
monitor orientation: Side-by-side (horizontal)

magick \
\( \
-gravity Center \
\( fig01* -resize 296x2160^ -extent 296x2160 \) \
\( fig02* -resize 296x2160^ -extent 296x2160 \) \
\( fig03* -resize 296x2160^ -extent 296x2160 \) \
\( fig04* -resize 296x2160^ -extent 296x2160 \) \
\( fig05* -resize 296x2160^ -extent 296x2160 \) \
\( fig06* -resize 295x2160^ -extent 295x2160 \) \
\( fig07* -resize 295x2160^ -extent 295x2160 \) \
\( fig08* -resize 295x2160^ -extent 295x2160 \) \
\( fig09* -resize 295x2160^ -extent 295x2160 \) \
\( fig10* -resize 295x2160^ -extent 295x2160 \) \
\( fig11* -resize 295x2160^ -extent 295x2160 \) \
\( fig12* -resize 295x2160^ -extent 295x2160 \) \
\( fig13* -resize 295x2160^ -extent 295x2160 \) \
-gravity South +append \
\) \
\( \
-gravity Center \
\( fig14* -resize 3840x167^ -extent 3840x167 \) \
\( fig15* -resize 3840x167^ -extent 3840x167 \) \
\( fig16* -resize 3840x166^ -extent 3840x166 \) \
\( fig17* -resize 3840x166^ -extent 3840x166 \) \
\( fig18* -resize 3840x166^ -extent 3840x166 \) \
\( fig19* -resize 3840x166^ -extent 3840x166 \) \
\( fig20* -resize 3840x166^ -extent 3840x166 \) \
\( fig21* -resize 3840x166^ -extent 3840x166 \) \
\( fig22* -resize 3840x166^ -extent 3840x166 \) \
\( fig23* -resize 3840x166^ -extent 3840x166 \) \
\( fig24* -resize 3840x166^ -extent 3840x166 \) \
\( fig25* -resize 3840x166^ -extent 3840x166 \) \
\( fig26* -resize 3840x166^ -extent 3840x166 \) \
-gravity South -append \
\) \
+append wallpaper.jpg