I have not owned a 520, but on several of my bikes I have the Greenfield stand that attaches near the rear dropout. Thorn (the bike manufacturer of the bike in the attached photo) also says that if the stand caused a frame problem, warranty is void. I do not know if you will find a manufacturer that will warranty a frame if the damage is from a stand.

The issue that Surly had was soon after they re-designed the LHT frame quite a few years ago, people that were installing kickstands immediately behind the bottom bracket shell were crushing the chain stays because the chainstay material was too thin or too weak.