Welcome to the forum
If it fits smoke it!
I have a SM066 but your grills are the same size as mine so I’d say you should be able to do 2 packers without an issue
The hot spot will be right above the smoke box so I’d say put the bottom brisket in fat side down and slide it to the back and put the top brisket in fat side up close to the front.
That’s what works for me in my AmeriQue.
Don’t forget to read
Smokin Okie's Brisket 101a rough guess would be an hour and a quarter to an hour and a half per pound
I like to put them an hour before bedtime and when they're done FTC (foil, towel, and cooler) them for up to 6 hours
Above all don’t forget to post pictures