For 5 days in Paris, 3 of them we'll be in zone 1-2. The other two days we'll be in zone 5 and 6. Can I buy a 5-day Mobilis pass for zones 1-2 and then add on to it the 2 days we are going further than that?

Also, our first day we are only going to our hotel, then to Louvre, and then back to hotel. Is the Mobilis pass worth it for that short of use or should we just pay single tickets that first day?