Non dash damage advice

[hellorent]

Hi all,

Got a lease car and want to stick one of those mobile phone disks on the dash to
mount a mob phone holder, any suggestions for a glue/adhesive that wont mark or
damage the dash when removed, I was thinking of using a silicone sealer but don't know
if it will leave any marks

Any suggestions welcomed, it's a Audi A6 if that makes any difference.