This depends on the workflow of your operation.

Some teams use joining Scannable as a chance to start fresh, so add their equipment to their Scannable inventory, inspect the equipment and add NFC tags all at the same time.

Another common practice is to add tags as equipment comes back into the storeroom.

We're happy to talk through the tagging process with you. It can seem overwhelming at first, but the reports we get back is the process is far easier and faster than people expect.