Of all the interviews I had done over the past decade, all of them afforded a place to project. These days the web is almost universally easiest, you can always lock down certain content with a password that you want to present in person, and you can project it on any machine, iPad, laptop, etc.
If you have the dongles and can project off the iPad that’s OK, but I’ve had people show up to interviews with an iPad presentation and then expected 7 designers to gather around the table and look at their content because they had nothing to project - that was a big no-no.