I have total 6 cameras, C520WS. I wish to connect them to Tapo H500 (and each of them still having 64GB sd card).
I notice some people say H500 only allow maximum 4 camera connect with 24/7 recordings.

If more than 4, need to use motion only recording? Is it true?

Scenario 1
1st~4th camera can be 24/7 recording to H500
5th&6th camera only can set motion recording to H500?

OR

Scenario 2
1st~6th only can set motion recording to H500 (when more than 4 camera, not allow 24/7)?

OR

Scenario 3
Maximum 16 cameras allow to 24/7 recording to H500?

Which scenario is the true?

Besides that, my house is double storey, i have 3 camera at ground floor, 3 camera at first floor.
can i get H500 (hub 1) at ground floor, and ground floor camera footage save to hub 1
then 1st floor another H500 (hub 2) and save 1st floor camera footage?

Another question is H500 is 2.5 HDD/SSD for external drive. Can I use 3.5 HDD enclosure which has its own dedicated power supply and then connect it via SATA to the hub? Do it works? I wish to get hdd surveillance, but what i found is 3.5"