How to Make a CRT Video Wall Matrix - Tutorial
cyberboy666 has an open source video wall mapper on github which you can build for your own devices (https://github.com/cyberboy666/tv_wall_mapper) or buy a prebuilt image from the store at underscores.shop (https://underscores.shop/product/tv_wall_mapper/)
oxfPiMapper is another openFrameworks video wall mapper - however be warned as it hasn’t been updated in some time (https://ofxpimapper.com/) but could easily run on newer pi revisions and openFrameworks versions if the requirement for OMXPLayer was removed in favour of something more performant