Both TBS and Immersions personal tracker offerings both use one module. I think this is worth perusing even loss of resolution. Might not be a good solution for large races, but practice days 1-4 pilots or even tinywhoop might be a good idea.
According to Immersions laprf app:
1 Pilot - 30ms/160kmh
2 - 60/90
3- 90/75
4-120/50

Plus battery life will be better, lower price, reduced BOM count, and smaller form factor.