I remember reading something on here about how someone had concerns about a using a rental car. One of the concerns was the key fob unlocked ALL the doors plus the trunk/hatchback. This obviously gives someone hiding on the other side of the vehicle an “open door” to jump in.
I own 2 Mercedes - don’t get jealous, I couldn’t buy a new pickup truck if I sold both of them - anyway it has concerned me that both of them operate this way. My concern is even greater for my wife even though she has great situational awareness (better than me), but none of us are invincible.
I researched and found the procedure for changing this setting on my vehicles. The procedure is easy, just not intuitive, press and hold the Lock and Unlock buttons at the same time for about 5 seconds. When a little red light flashes on the key fob, the setting has been changed to only unlock the driver’s door on the first actuation of the Unlock button, and unlock the rest of the vehicle with a 2nd actuation of the Unlock button.
Might be worth doing a quick internet search on your own vehicle(s) or the next rental vehicle(s) to see if setting the operation of the Remote Unlock is an option.