Multiple Remote Location IPCams Setup

[Holbs]

I just started research this and this seems like it could be pretty effective. Could the cloud gateway ultra's be used with out the flex mini's if the Camera had its own power supply vs POE? Essentially are the ethernet ports on the cloud gateway ultra only Wan capable or could they be used as Lan? It seems I would also need a management device like the UDM pro to link all the cloud gateway ultra's. With this setup it seems I wouldn't have to mess with VPN's at all. am I following right?

Constructions Site #1 / Pole #1 has it's own ISP internet service from Construction Site #1 / Pole #2 ? If so, yes... can do Ubiquiti Ultra routers that do 4 port POE. If Pole #1 and Pole #2 share same ISP, you list 5 cameras but the Ultra router only has 1 WAN and 4 LAN ports. Hence, the need for a Unifi switch in between somewhere.
I just like the Unifi ecosystem when it comes to multiple site VPN's. It's a breeze. And leaves a lot open for future edits/changes/moves & adds.
You would not need the UDM pro to manage all gateways.
Just need 4 or 5 cloud gateway Ultra's.
You manage via Unifi account & webpage.
Yes, you would still 'mess' with VPN's. But VPN setup is a breeze with Unifi. Scan QR code for each gateway Ultra and whalla. Done (mostly).