Spambots look for "mailto:" links. Put one on your site with a real or easily-demunged address behind it, and you WILL get spammed.

Safety: your choice, but remember that nobody is going book anyone who can't be contacted quickly and reliably - which means handing that business mobile number out to pretty much anyone who asks, and letting them do whatever they want with it. If you don't do that, the main thing you'll be making yourself safe from is income.