Hi Dbl-A-Ron, I mounted one lengthwise left of the AC at a very slight angle due to roof shape and the other cross-wise, aft of the Heki skylight because I had previously installed a bat-wing antenna on the right side. There are no shading issues. The mounting feet supplied with the AM Solar panel kit allow for angling and height adjustments at the different corners of each panel which is the key to mounting on the odd shape of a Northern Lite roof. Check my post on the Northern Lite owners forum, www.northern-lite.com for more details on a NL 10-2 installation. We're enjoying the Florida sun with friends for a few more weeks and then we'll be heading home in no particular hurry for maybe a month or two. -Mark.