2011 Honda CRV rear tire wear/camber kit

I bought a used 2011 Honda CRV about two years ago. Over time, I noticed
an odd wear to the rear inside tires (wavy), resulting in loud road noise. It
was due for tires, so I assumed an alignment was in order when I got the
new tires installed. Over time, I'm noticing the same type of wear in the rear
tires! I'm rotating every 6k miles. My CRV, like many out there, look as
though the rear tires slant inward from the top when looking from behind.
The dealership was useless, but recommended an aftermarket adjustable
camber kit. If this would help prevent the eating of the inside rear tires, I'll do
it but would like to know if anyone has gone this route. Thanks.