Can camera wires be placed under the roof tiles

You can buy special metal brackets for roof tiles:

Most of the roofs I have seen have used nails, and only in certain places, relying for the most part on the friction and weight of the roof tiles to hold them in place. Whether brackets are required depends on wind speed, wind direction, subroof type, roof angle, roof shape, height, and other factors.

Regardless of whether you use brackets, nails, or screws, they must be stainless, galvanized, or otherwise protected from corrosion. Nails must have ring-threaded shanks.

(Source: manufacturer's instructions for various roof tiles sold in Norway. Check your local building codes and the instructions provided by the manufacturer of your roof tiles.)

Leaving the lag bolts in is fine, but the bolts are likely made out of galvanized steel, meaning they will rust and corrode eventually when exposed to constant rain and water. It is best to liberally apply roof cement patch to the lag bolts to ensure that no water will corrode or leak through where the bolts are.

You can get roof cement patch in a tube form like so that easily fits into a standard caulking gun.

It will eventually wear away so I would check on the patches every 3 or 4 years to make sure they are still there.