For a first time visitor to Las Vegas, stay center strip.
The Signature @ MGM Grand was built for residents. It is not a timeshare and it was never built for that. You will not be approached by anyone trying to sell timeshares.
I have booked Signature @ MGM for as low as $80 per night (before resort fees), when the Bellagio, Wynn, Venetian, etc. was well over $200 for the same night.
For a first time visitor to Las Vegas, stick MID-STRIP. Forget Signature. Go for something like Bally's (4*) Jubilee tower, high floor, odd numbered room. That will face Paris and you will have a partial view of the Bellagio fountain show.
Safe and happy travels.