You can pin code the glove box, but there isnt any real need to put it in valet mode or anything. If you using the right shop, they have done tons of teslas so there isnt anything special there for them in relation to driving it.
If you had a model S plaid or something, that might be different, but they are not going to have some desire to "hoon" around in a regular LR model 3.. unless you are going for some bottom tier shop who hasnt done many teslas or something.