Small fightstick question..

Hey guys i bought the hori mini 4 its rly tiny but its ok for now untill i can save up for tournament edition
but anyway , i put it on my table it does have feet but sometimes it still slides what should i put underneath it?
ive tried a book the book works but then the book slides on the table lol instead of the fightstick on the book so im not sure
what the best way to play and hold this thing...