i used steel book shelf brackets .they hold heavy books up so why not 10 kg SUPS ,
I USED 100 -120 ml pieces of wood and cut pieces of carpet and just dropped a bit of roof silicone ,to hold the carpet
on ,dam sight cheaper than glue 15$ a tube done the lot ,once you find your wall stud measure up ,cord less drill
screw them all in and all done in lees than a hour .
the 14's i use heavier duty brackets ..4-6$ each .get the painted ones ,
i used stainless screws just in case salt got on them ,and waked a few in the wood 100ml pieces as well ,made it more secure .
you need 2 different size screw .
if you took the fins out you could have them closer