I puzzled over awnings for a long time. I was thinking for awhile that I would attempt to mount a Fiamma up high on the side of my pop top (above the porch lights I added), and it would go up with the roof, but I eventually decided after seeing various bracket failures in sheet metal that there was no way this would work out mounting through fiberglass. Also, way too high if a storm blew in suddenly and I needed to drop the awning in a hurry. It was a neat idea I thought, but not willing to gamble with a $1k awning.
Here's what I came up with
It's a bag awning, usually used on a truck camper or pop up. They slide on to an aluminum rail, and I hid my rail right against the edge of the pop top fabric, where there is just enough room, and did NOT pin it on the ends as you would if it stayed on the camper.
The great thing about these awnings is they are just a few hundred bucks, and the modern ones are VERY well made, with all of the adjustability of a full bore camper awning (but not electric).
I didn't like adding this, but wanted more stability than both poles to the ground
There is one huge catch which makes this a no-go for most folks, and definitely my least favorite part. You have to remove the awning and store it when not in use. It could hang on the side of the van, in theory, but not mounted under the edge of a pop top. I would personally never do this because it's hideous and in a white bag. I'm looking in to having a black bag made for it, but not too worried about that now since I remove it. Also, not sure which other tops this idea would work with. I can walk mine in to the side door angled upwards and it just fits inside my pop top with the top down. We just slide it to one side and it doesn't interfere with walk around space while travelling. Another plus about these is you can have them made in any length. I got the longest that would fit on my van. In my experience, the best way to guarantee rain is to plan a camping trip, so we have a big dry porch (12x8 I think) now, and no rain comes through the attatchment rail.