You can do what feels best to you, of course, nut why sit at tge back and say a rosary? If i were you id be near front (not right at the front, you need the security of a couple of rows to guide you!) ad watching and absorbing the Mass! Just personal preference, its just further back i don’t sas much and there’s more people to distract me. And i never oray a risary, again, just personal preference, as my mind is definitely elsewhere. I prefer to watch, sometimes pray along and follow the missal, but often just watch and mentally pray while contemating the beauty of the Mass itself and what if happé, even if i csnt hear it, if that makes sense. Even the body postures of the servers i find beautiful, humbling, eg diring confiteor, which you wouldn’t see from the back.
But what you propose is perfectly fine if that suits you. Its just you seem to be going to a lot of thought and effort.