On my boat
FWIW: On my boat, they are mounted in the compartment under the forward vee berth. This seems to be a good location, at least given the way that my trailer is designed. I suspect that forward is a good place, especially for the speed sensor, since it may avoid flow changes caused by the keel. My ST40 was mounted there by the PO, so I never thought about the 'best place' option, but since we both have the sport model, perhaps this will help some.
Welcome aboard, good to see another Sport owner.
OC