We have two series that can work with HomeKit: eufyCam 2 Series and Indoor Cam 2K Series. 

For eufyCam 2 Series, a HomeBase must work as a bridge and can only add up to four eufyCams under the Home App at the same time. If you have more than four eufyCams, to get around this, you can prepare two HomeBase so as to connect with more than four eufyCams.

For Indoor Cams, there is no limit on setting up indoor cams when you only live stream the indoor cams. If you want to record videos, you need a 200GB iCloud storage plan to support one indoor cam and a 2TB storage plan to support up to five indoor cams.