If you want to tow close but maintain a set distance, use a poly rope pulled through a 1 1/4 PVC electrical conduit. This is a great way to keep it off your swim platform, and the rope out of the prop.
If you want stiffer setup, use two conduits in a Vee, one from each side of the swim platform. it will always keep the bow centered with your boat...
next question is day shapes... do you hoist the towing / under tow day shapes
Stu