I have run out of room in my breaker panel, so I'm looking to double up with a tandem breaker. The problem is, it seems there are no AFCI tandem breakers, but I found these dual function AFCI / GFCI outlets and I'd like to use them to protect any downstream outlets from any detected arcs or a ground fault. I know the NEC permits the use of GFCI outlets to protect any outlet downstream, but does the same rule apply for AFCI? Will a dual function AFCI / GFCI receptacle meet the NEC requirements for protecting any downstream devices from potential arcs? Does it matter if, for example, the first outlet is ~15 feet from the breaker panel? An arc could happen somewhere in the middle of that first 15 feet of upstream cable if there's a break in the wire.
Edit: This is for a Square-D Homeline panel. All wiring is NM/B.