First, am I right about your location? Are you near Greenwater? Knowing the correct location makes a LOT of difference if the type of signal you can expect to receive.
Second, Nomad is just a reseller of wireless service; they are an MVNO (multi vendor network operator). They aren't selling anything you can't get directly from the carrier. The only thing they offer is that if you are regularly traveling (a nomad) then they will automatically provide you service from the best network that they have an agreement with, regardless of who that may be (AT&T, TMO, Verizon, US Cellular, etc.).
Third, be aware that NO wireless provider will guarantee a speed to your location, and anyone that does, you should RUN FROM. They will emphasize that they will provides speeds UP TO their maximum throughput, but without a site survey they can't really say what you can actually expect, and site surveys are expensive.
Fourth, the available speed that you can get will depend on your location relative to the tower; the farther from the tower you are, the slower the speed. The more 'noisy' you local radio environment is, the lower the speed. The more obstacles that are between you and the line-of-site to the tower, the lower the speed. As I said previously, for where you are, on TMO's network, I would expect around 10 Mb/s, optimistically.
Fifth, with respect to Nomad SPECIFICALLY, they apparently went through some shenanigans late last year. Based on what I'm reading, I wouldn't trust them, but what I'm reading is over a year old.
If you know someone there who already has cellular service, they can go to speedtest.net and run a speed test to see what kind of performance they are ACTUALLY getting, and that can give you some idea of what to expect.