We can have lots of devices streaming 1080p content at the one time so was going to get a tri-band for the extra bandwidth and for the future proof factor. Features like Adaptive QoS might also come in handy from the ASUS.
What I've seen of so-called "tri-band" devices (which admittedly isn't much) tend to be dual band devices with two radio chains serving the 5GHz band, (which is no bad thing.) So you've essentially got 3 AP's in one box, one AP for 2.4GHz and two for 5GHz. To be effective, you'd need to ensure the two 5GHz AP's are set to different channels - hopefully their OS takes car of this for you.
I have tried changing the channel a few times and it doesn't make any difference. I was going to get an access point but i don't think that would stop the random wifi disconnects?
Not if the cause is external. There's nothing different between Wi-Fi from an AP and a SOHO router. The Wi-Fi functionality of a SOHO router
is an AP - it's just built into the same box as loads of other gubbins to get you on the Internet.
If you get your clients and AP/routers closer to each other, sometimes it's more reliable as the "signal to noise ratio" of the unwanted interference and the wanted transmissions improves. Rather like standing next to someone and talking with them will tend to "mask out" any background noise that would be more of a problem if you stood (say) 10 meters apart.
Though we've far from proven that interference is the issue. At the moment, we have no evidence, just a symptom.
Do you have any recommendations for an access point that will work with the VM SuperHub?
In SOHO gear, AP's & routers don't "talk" to each other in any meaningful way (as enterprise kit does,) so pretty much anything should be fine. Some people use old "crippled" routers as AP's as it's sometime cheaper and/or they have one in hand. There's and FAQ on the subject pinned in this forum.
The "trick" with outpost AP's is how you establish the "backhaul" link from the outpost to the rest of your network. "Proper" cabled ethernet links would be best, tunnelled over the mains using HomePlugs is (probably) next best, Wi-Fi backhauls are also possible but we regard them as least good as they tend to clobber the throughput (speed) and physical positioning is important to form a good link.
There's also an FAQ on HomePlugs pinned in this forum - some of them are available with a Wi-Fi AP built in. They seem to be quite popular with people who find they are precluded from installing ethernet cabling.