This really comes down to personal preference. For me (George) personally I only wear the single side because I really do not like having to wear anything “extra” than what is absolutely necessary, but there are plenty of people who think along these lines and wear a double even though they only have a hernia on one side. It definitely will not hurt to do it that way. Just keep in mind that the double belt is a bit more bulky because of the extra leg strap and the wider pad in the front to cover both sides.
Hand wash only, luke warm water, mild detergent, air dry.