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I'm planning a network setup based on these components.

TL-ER6120 PLC Router
[*]AC500 WLAN Controller
[*]5 * CAP1750 APs
[*]2-3 * T1600G-28PS (24-port L3-POE-Switch)
Furthermore i'd like to reuse some existing network components:
1 * TPLink TL-SG2424P (24-port L3-POE-Switch)
[*]2 * HP ProServe (24-port L1-Switch)
The only construction related constraint: Two switches are going to be located in different, but not distant offices (~25m), and they are going to be connected via fibre.

Hosts are roughly:
25 IP-Phones
[*]100 PCs+Mobile Devices
The TL-ER6120 router is supposed to handle WAN and DHCP.

I need to setup a guest wifi and look for some advice. Guests must be isolated from the internal network and be able to connect to the internet. Is that solely configured in the AC500? I suppose there's no dedicated option for that in the web interface, like e.g. some consumer routers, right?

I'm also wondering what's the best way to wire up the Router, WLAN Controller and Switches. Would the AC500 better be plugged into the Router or one of the L3-Switches?

Thanks in advance.