Rhino-Rack Sunseeker II awning

I set my eye on a Rhino-Rack Foxwing awning. Unfortunately, the construction would end up to tall to fit in my garage because the Foxwing needed to be mounted quite high to clear the opened tail gate. So I settled for the Sunseeker II. A Thule 952 roof rack (20cm high) would fit the high roof of the L300 perfectly but the popup roof is mounted so far to the back of the roof that I needed a Thule 953 (28cm high) to have enough clearance to allow the popup roof to open. The awning comes with two brackets. After drilling holes in the Thule cross bars, the awning can be bolted to the roof rack.