I have a few things being delivered over the next week from Crate and Barrel and Restoration Hardware. One item is literally a bring in and place on the floor (a console table) and the other is a bathroom vanity that comes assembled but goes upstairs and is placed on the floor. Both places charge a delivery fee (ranging from $70-100). What's the general rule of thumb for tipping in this case? I was thinking $10 per delivery person. Thoughts?