@Johnely here is an overview of the omada switches. https://www.tp-link.com/en/business-networking/all-omada/#omada-switch TL-SG2428P is a cheap and good switch with 250W poe budget.

@user0142587 about the same as unifi, but you have to upgrade the router to 1.2.3

@Lasermatrix you cannot adopt a router in a vpn tunnel, it must be adopted on the wan interface, but after the router has been adopted to a remote site you can adopt the access point and switch in...

@Forever1337 is the WAN connected directly to the internet or do they go via another router? which IP has the wan interfaces, the 10.0.0.0 network is commonly used on many routers, so perhaps you...

@Forever1337 strange things.. what firmware do you use? I use the latest 1.2.3, I have also only one WAN configured.

@Forever1337 is there such a configuration that does not work? I did a test on an ER7206 here it seems to work without any problems