I would trust an html file to validate existence of your site with their signature but I would feel very uneasy about putting executable code from a vendor on my site unless I really understood it line-by-line. Also, ask whether it's just for initial verification or if they need you to keep that file permanently placed there. If it's just a .html file, putting it in the public folder should be no problem. I do that with SSL cert issuers all the time.
Norm
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