The use of ?tables?, i.e., a single flat solid surface extending under
both front rest and rear bag is prohibited. Carpet or similarly
flexible matting may be placed under the front rest and rear bag.
Separate flat boards and/or plates not exceeding the dimensions
of the individual rests by two inches on a given side may also be
placed under the front rest and rear bag. In the case of a bipod,
the board or plate may be as wide as necessary to accommodate
the bipod at its widest point, but not more than 12" front to rear.
It is not permitted to provide tracks for the guidance of bipod feet.

Am I allowed to stack more than one plate under my front rest?

Same question for rear bag?