Summary

I bought a few of these for outdoor cameras. They work great. https://smile.amazon.com/gp/product/B0711CPL5Z (Regular non-affiliate link)
I needed something similar for indoor cameras, yet apparently dome cameras don't have a lot of options. Also, the price wasn't that attractive either. So, since I needed a bunch more for indoor use and considering I didn't care about the waterproofing for indoors. I made it in tinkercad.
Amcrest AMCPFA136 Junction Box for Dome Cameras,
Should be compatible with the following armrest model cameras IP3M-956B/W, IP3M-956EB/W, IP4M-1028B/W, IP4M-1028EB/W, IP5M-1176EB/W, IP8M-2493EB/W, IP8M-2493EW-V2, IP8M-2496EW-AI
The B/W at the end is their model scheme for colors the B is black, and W is white. Also the E stands for PoE support.
For example, I have the IP8M-2493EW (v1) and it is a white PoE camera that works with this adapter.