Marlo

As you are probably know, RAV4 GX model does not come with roof rail. I have asked a Toyota dealer if one can be installed and reply was it could not be retrofitted. I found on eBay a seller for roof rail that will fit RAV4 2019+. https://www.ebay.com.au/itm/192243352787?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 Does anyone have an opinion if I should buy this and install it myself ? Would installing this possibly void my insurance and/or Toyota warranty ? Thank you.