hi there, very new to Omada devices and such but i have a question regarding the setup of a VPN

i have 3 surgeries that i need to link via a VPN to mainly just provide the LAN-to-LAN connection and have their stock system connected through the 3 branches

the plan is to get 3 vpn routers (ER707 M2's), 3 PCs to act as controllers for each router and of course the necessary switches... we plan on having all 3 routers under on tp-link account as well

so my question is, i have seen you can use Auto IPSec to establish a vpn connection if all the devices are connected to the cloud, does this refer to a cloud controller or just devices linked to the same tp-link account? And will having the same sub-nets for the stock system machines cause collisions on the different sites?