I am about to do an install using 25 AP910c & 3 AP900. I have 2 x Draytek 24 port gigabit PoE switches & all necessary interconnects, patches etc.

If the 2860 could handle more than 20 APs I would only install 1 router, but as I need to manage more, can I use 2 2860s together on the same network whereby all devices connecting to any AP regardless of physical connection will operate normally without issue?

Or if this is the wrong way to do it, what is the correct way?

Cheers, Steve.

yes you'd need another controller. the 2 2860s don't sync their profiles and be careful if you are using Auto provision with more than one controller

How many APs do you need in total ?

28 in total I think, no more than 30 it's a big site!

The Vigor2952 can do yup to 30 APs.