> Have you tried to hire anyone to do remote work, even freelance work? Most people fail miserably if you don't give them structure(and being on-site is a type of structure).

Have you tried to hire anyone at all? Recruitment is hard. Period.

Failure to track production/results is completely unrelated to where your employee works, as well as failure to produce is only related to the employee. If he/she does not know where he/she best produces, the recruitment is bad to begin with.