I just cooked a firmware with the cooker for the tp-link cpe-510. It is similar to the nano loco m5 - 45 degrees horizontal angle, 13dbi, and 5ghz only in this case. Costs around USD 65 here.
Everything seems to be fine. It uses adhoc mode by default, so it connected immediately to a wdr3500 with lime 1605 from another network which I had lying around.
The reason I'm flashing these is that we installed a small network in a favela here last week, and the wdr3500 didn't have enough reach. Not only the nearest nods were far (anything from 200m to 2km), but also all the interference we had (it's a really dense neighborhood) made any link with more than 100m very poor. The plan now is to connect the most important nodes with those.