Here's a photo I took of Alonso signed baseballs being sold by the Mets at Citi Field. Each ball is signed but I positioned them differently so you could get an idea of where the holograms are located.
As you can see, the Fanatics hologram is above the Rawlings logo, and the MLB hologram is above the MLB logo.
Fun fact: the MLB Authentication Database identifies the ball in the middle as follows:
Item: Autographed Baseball
Hologram number JB739447
Event: Pete Alonso - Fanatics
Date: May 09, 2019
Autographer: Pete Alonso