I mounted a large (325W) panel above my bimini just behind the arch this year.
I had already added horizontal struts (1" s/s tubing) to the bimini frame and replaced the two vertical aft web straps with 1" s/s as well. I then only needed to add two 1.25" angle aluminium pieces from the arch out to just aft of the bimini. I then cantilevered these back down to the aft verticals on the Bimini frame. I think the pictures below will help.
Also you can buy a variety of kits from Emarine for Bimini, rail or stantion mounting of panels,
https://www.emarineinc.com/170-Watt-Top-of-Bimini-System-Dual-85W-Panel
The panel is mounted close to the Bimini to reduce some of the windage and not dominate the look of the boat.
Good luck, Bob