Note: I am very experienced with the adhesive, but not at all familiar with the router. I find the adhesive useful in the shop without the CNC router.
Not strictly speaking “double sided tape”, Scotch (3M) Adhesive Transfer Tape applies the adhesive only—no tape. The only way to remove the adhesive at that point is to use a solvent.
But it is fast, easy and widely used in the picture framing industry. When I had my frame shop I routinely used it to join double and triple mats, to apply the dust cover on the rear of the frame, and for stretching needle point prior to framing.
The dispenser is so much faster to use than tape, that once you’ve used it, you will not want to go back to using tape. That having been said, 3M offers a manually applied version. It saves you the cost of the dispenser. I recommend the dispenser.