Hi @tp4sb 

Could you share the previous topology and the future topology at the same time? Meanwhile, we may also need your help to confirm how did you set the VLAN on controller. It will be better if you can add the subnet notes on the topology you provide.

And I can tell youtthe blow information by now:

1. As long as your VLANs are configured on controller for your router/EAP, yes you should be able to apply the settings for the new EAPs once you adopt them. And the VLAN settings can also be applied to the TL-SG2008P.

2. For the connection to OC200, it depends on the new topology. Connect the OC200 to the ER605 will allow you not to lost the controller management that easily due to the incorrect VLAN settings on switch' or router' ports.

  @tp4sb 

You will be fine, though I do have some suggestions for you.

1. for a little extra, get the SG2210P over the SG2008P, then all 8 ports have POE.  I have both, and wish I didn't.

2. by default, switch ports have the 'All' profile and so will behave like your unmanaged SG105 out of the box

3. I would connect your OC200 to the switch and leverage it's POE (especially if you have the switch on a UPS), switches also have much shorter downtimes during upgrades which can be important for fast roaming, and portals.

4. Do not leave the 6Ghz ticked on your SSID definitions as the APs don't support it, here be dragons.

5. Not sure from the diagram, but do not use both ports of the OC200 except when you need to jack directly in with a laptop for config reasons (it's only a 100M switch).  Treat it like a stub device, not a passthrough.

  @tp4sb 

For reasons given above, otherwise good, but suggest this (whether or not you have a 5th POE port for the OC200 or not).

  @simbar 

Because you already have the SG105P's, you can group similar equipment together using the ports of this device, and then uplink to a single non-POE port on a device like the SG2008P.  That way you would get the benefit of Switch ACLs in the 2008 etc, but you no longer have the ability to powercycle or monitor power consumption of connected devices by port.  In my case, adding cameras to my initial AP setup made using the 2008P painful...so I replace it with the 2210P.  Good luck!