OP, If I were you, I'd put MMR on the 60+3 day, book MMRR first when you do your FP+, then immediately do FoP on 60+1. Be aware that you might end up with late-afternoon or evening times for both. I just did my FP+ yesterday and MMRR was available only in the evening for my 60+2 day. I didn't look at 60+1 for MMRR, but I got FoP late afternoon for 60+1.
Remember that you don't have to book all your park FP+s for any particular day. Do the hard-to-get ones first, then go back and fill in.