AP one mini and Peplink Balance 580- WDS?

Hi… i have a peplink balance 580 router that an AP controller for 3 AP one minis in a small 9k sq feet office. we have about 60 users.
They are all using a switch as backbone… do i need to set up WDS?

Also… do all the AP have to be on the same channels for both 2.4 and 5ghz? or leave it on Auto?

Users have been complaining of disconnection and low speeds and i am trying to fine tune the APs for a more stable connection.

If all of the AP One’s are connected via Ethernet to the backbone switch then you would not setup WDS. You could leave it on auto or manually select the channel, recommend doing a site survey.