I didn't know there was a separate CAV toll tag, I already have the Flex one.
Seems like the CAV stickers are primarily just for identification for police officers? If we happen to "forget" to stick them on, but have them in the glove, would it be just a fix it ticket, probably depends on the cop and their mood on what you'll get. As far as toll use, don't think it's verified by a camera, but just the CAV toll tag, so sticker has no use here?
There have been lots of discussions by the Tesla guys on the web regarding this. As far as driving around, I've seen people do it all sorts of ways, only single sticker on the back bumper, or only two stickers, one in front corner and back corner, or just two rear corners.
These stickers are anti-theft/tamper, therefore you only get one go and cannot remove them easily. Since I live in the south bay and hardly use fast trak or tolls, worst case I'll probably use magnet solution to stick on as needed.
Affixing CAV Decals to Your Vehicle
Carefully peel the decals from the backing material and affix them to your vehicle:
- Large decals: Place one decal on each side of the vehicle, on the rear quarter panels behind the wheel wells, with the state seal pointed up.

- Small decals: Place on the right and left side of front bumper, with the state seal pointed up.

Do not attempt to remove or reposition CAV decals after application. Doing so will destroy the decals.