Do you mean here? Anyway, a quick question : What software do you use for txt atlasing? Do you have some tips about it? Because I’m trying with Gimp rn but there’s something wrong with grid snap. 
This question will be closed soon, so you can DM me if you have any other questions.
As for atlasing software, I usually use this amazing flipbook tool.
It’s only a few bucks for a permanent purchase, and I use it all the time for laying stuff out in grids. Highly recommend.
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It depends on what you mean by atlas, if you are not using virtual textures then the limit is 8192 x 8192 in which you can fit 4x 4k texture or 16x 2k textures or 64 1k textures inside and so on and so forth,
If you are using virtual texture then the limit is very higher for context I did a 116x 4k textures into 1 large textures ( they are called UDIMs generally), I made a custom plugin and released on fab for UE which allows creation, modification, extraction of UDIM textures & many more features inside the engine.
Link: UDIM Editor | Fab