Recommendations for RaspberryPI 4B case? - SLRPNK

Hiya, so I have a spear RaspberryPI 4b, and want to selfhosted HomeassistantOS on it, heard there were some advantages of running the full OS and not just the docker container. However I currently don’t have a casing for it. So: Is there anything I should know before buying one? Does the rpi get very hot running HomeassistantOS? E.g. Do I need one of these cases with a fan built into it? Or is it OK without? Appreciate any tips or suggestions! however I will not order anything from Amazon or Ali Express or any of those type of websites. Feel free to recommend via them though as I might find the same case elsewhere, perhaps. 🌻