Best case, you want to get some low VOC silicone or rubber cement.
Once you have that, I take a piece of flexible bandage, cut to size, stick it to the underside of the surround, smear some of the silicone on the back, then do it again on the front.
Once all cured, if you don't find the low VOC adhesive in black, a little permanent marker usually does the trick.
I see people use thin bike tire innertube rubber sections the same way, piece on the front ant the back.
If you can't find the Low VOC, then regular rubber cement or silicone sealant/adhesive will work in a pinch.