If I fitted that arrangement, I would have four limit switches. 2 adjustable ones, for setting up repetitive cuts, and 2 fixed limits at the table extremities of travel – to prevent any really serious damage.
As it is, I’ve not bothered to do that on either of my mills – I simply don’t let them run unattended. Most of the time the tables are fitted with more than one item – either a couple of vises or a vise and a rotary table.