Are your eeros using wireless or ethernet backhaul? If wireless, I'd say the 6e is a good choice as it'll likey use the wifi 6 channel for backhaul (leaving 2.4 and 5 available for devices).
If ethernet backhaul, the 6 channel is pretty much wasted unless you have numerous 6 devices (which many of us don't) -- in that case, I'd stick with the plain Pro 6 since you can take advantage of both its 5 channels.
