Driver/Passenger side fuse box questions

[SARNCAN]

I want to install dash cam and accessories to my vehicle, and I have some questions regarding 15+ Tahoe/Yukon fuse box.

1- Is fuse type used Micro2?
2- Although that many spots shown as (empty or spare), fuses cannot be hold there and I guess no metal contact is there. So it is useless.
Any suggestions? Would like to use a specific spot for each accessory, not to share fuses. If so, what fuse should I share as a safe option? Such as sharing a heating steering wheel fuse taking in consideration Amps and Volts.

 

[Camarochief]

pull a fuse out and look at it. lots of different styles.

 

[greenhornet]

Most spots use micro micro 2. I have tapped into circuits like a tail light or licence light.I have 2 dash cams and have had no problems using a circuit that is always live as the cam does not use much power for years..They sometimes record for days with no problems.Just use a test light and pick safe fuses like lights ,not sensitive fuses for memory or Computer.

 

[SARNCAN]

Most spots use micro micro 2. I have tapped into circuits like a tail light or licence light.I have 2 dash cams and have had no problems using a circuit that is always live as the cam does not use much power for years..They sometimes record for days with no problems.Just use a test light and pick safe fuses like lights ,not sensitive fuses for memory or Computer.

So why all those empty fuse spot exists?
My concern is the over use of the fuse and wires above ratings, if so