Diane, my wife and I usually lay our packs on the ground under our respective vestibules -- plenty of coverage there to protect them from the weather, plus I fasten our pack covers over each of them, tucking the cover underneath them.
Using the vestibules for storing the packs at night (along with footwear) obviously leaves a lot more "people" room inside the Evolution.
But then there's the mice to consider -- well, the good news is that, compared to bears, mice seem like they could be great neighbors!!! Even if they chew a bit.
Fortunately, we've never had a problem with mice. Don't know why. Maybe it helps that we try to not keep anything at all in the packs (or the tent, for that matter) during the night that might tempt a critter to chew on them, or worse yet, on us.
Everything that might smell (except me, of course) goes into a hang bag outside, far away from us. That includes food, first aid kit, insect repellent, kitchen, etc.
Our Evolution's length is 10" less than the 94" length you describe for your REI Quarterdome, so there's that much less room at the foot or head of the Evolution.
If the ground is muddy, we try to find a few flat rocks to lay our packs on under the vestibule. If we can't find rocks for keeping the packs off muddy ground, we just bring the packs inside the tent and put them under our legs, which is also what we do in the first place when using torso-length pads that don't extend under our legs. The "under-the-legs" option works fine with packs that are frameless after most of our "stuff" has been removed for the night (sleeping bag & pad, edibles & smellables hanging in a tree, "extra" clothes stuffed as pillows, etc.).
The Evolution is THE shelter that my wife ALWAYS wants us to use when backpacking, for several reasons -- comfortable for two (with above caveats about storing packs); two-doors with individual vestibules are convenient and provide "storage" freeing up the interior; excellent weather and bug protection; nice "extra" features for such a light tent (pockets, window at one end, flexible pitching options); easy to pitch; and well constructed (notwithstanding the velcro issue that was corrected by the seller soon after I received the tent).
The only drawback -- wish it were even lighter than it already is.
As for storing packs inside the tent to avoid mice chewing on them in the vestibule, and without resorting to the "under-the-legs" option described above, the Evolution 2P is definitely not as spacious as the 10" longer Quarterdome.
Given the Evolution's 84" length and our "average" height (about 5' 8 and 5' 11") there's some space (realistically, a foot at most) at either its head or its foot.
However, note that the foot area of the Evolution is more limited than the head of the tent because the floor width tapers from 56" at the head to 46" at the foot.
Hope this info helps.