Just be aware that while there are (in the US) 11 wifi "channels", all but 1, 6 and 11 overlap some. Assuming there is no wifi around you, that means you only get three really clean channels. I'm not sure how many consoles you are going to be traveling with, but three wifi points in one room on isolated channels is all you are going to reasonably get away with - if they are in the same area. If the site you are at has wifi (or some !^$@# in the crowd with his personal hotspot turned on) then you will have fewer channels to pick from. If you need multiple wifi networks on a routine basis, there are wifi access points like the Ubiquity Unifi's that can have four SSID's on one radio. You can use VLANs to isolate one console per wifi network if you still desire, but it dramatically cuts down the potential for interference for you.
Also if you are going to be using more than one AP for coverage as you talked about later in your post, Unifi makes that dramatically easier too..
If there is interest in this from you or anyone else and more details are desired, we should probably start another thread
And should you think a solution like Unifi is expensive, the 2.5GHz models can be found for $70 a piece. The Pro model which is dual radio and also has 5GHz are quite a bit more relatively speaking - they are around $240 - but the 5GHz band is far less crowded and is probably going to be worth it in the long run.