Is it possible to make max altitude 7m, so less than 10m?

[7tronics]

The HS120D is a great photo drone for introducing a group indoors in a gym. BUT the ceiling struts are just over 24ft high, which is pretty common for a gym, so just about 7.3m, so is it possible to poke a value into the app with return altitude of 6m and max altitude of 7m? The version of the HS GPS V1 app only allows us to set the return alt at 10m and the max altitude to 11m. Do these settings even work indoors where GPS signals are too poor to lock in?

Thanks, Mark