A:AnswerThe center of the unit, the circular shiny part is where you attach the suction cup. Then you just place the unit on top of your dashboard and the weight of it combined with the rubber grip part on the bottom will hold it in place. No need to attach anything to the windshield.
I have the NUVI 2555 and it works great with this. I would assume the 760 LMT uses the same or similar type of windshield mount so it should work fine.