Looking at player pairs (complete data
here)
37% of all rostered QBs are stacked with at least 1 WR or TE from the same NFL team (last year: 35%)
12% of entries stacked all of their QBs (last year: 12%)
The average stacked QB had 1.22 WR+TE teammates on the same roster, so stacks are mostly single stacks rather than multistacks.
The average stacked QB had $18 of WR+TE teammates on the same roster, which is slightly more expensive (1.1x) than you'd get from the average price of rostered WR+TE.
Here are the most common QB-teammate pairings (including all positions):
5.1% NE RB TreVeyon Henderson with Maye (+1.4% over expected 3.7%)
4.8% DAL WR George Pickens with Prescott (+2.0% over expected 2.8%)
4.4% WAS RB Jacory Croskey-Merritt with Daniels (+0.1% over expected 4.3%)
3.7% SF WR Ricky Pearsall with Purdy (+1.0% over expected 2.7%)
3.6% GB WR Matthew Golden with Love (+1.3% over expected 2.3%)
2.8% JAX PK Cam Little with Lawrence (+0.6% over expected 2.2%)
2.8% DAL WR CeeDee Lamb with Presott (+1.5% over expected 1.3%)
2.7% HOU RB Nick Chubb with Stroud (+0.2% over expected 2.6%)
2.7% TB WR Emeka Egbuka with Mayfield (-0.1% below expected 2.8%)
2.7% CIN WR Ja'Marr Chase with Burrow (+1.7% over expected 1.0%)
2.4% CAR WR Tetairoa McMillan with Young (+1.0% over expected 1.5%)
2.3% LAC WR Keenan Allen with Herbert (+0.6% over expected 1.7%)
2.3% CIN RB Chase Brown with Burrow (-0.2% below expected 2.6%)
2.3% GB TE Tucker Kraft with Love (+0.9% over expected 1.4%)
2.0% DAL PK Brandon Aubrey with Prescott (+0.1% over expected 1.9%)
2.0% HOU WR Nico Collins with Stroud (+0.8% over expected 1.2%)
2.0% NYJ RB Braelon Allen with Fields (+0.5% over expected 1.5%)
2.0% TEN WR Calvin Ridley with Ward (+0.8% over expected 1.2%)
Expected is based on the overall ownership of each player, e.g. Pickens is on 15% of all rosters, Prescott is on 19% of all rosters, so you'd expect 15%*19% = 2.8% of all rosters to have both if people weren't going out of their way to pair them. Instead 4.8% of rosters have both, which is +2.0% higher than that.
Another way to look at it is that Pickens is on 25.5% of all rosters with Prescott vs. 12.3% of the rosters without Prescott, which averages out to 14.8% of entries overall. So you could look at the gap as +13.2% (or 2.07x) for Prescott rosters vs non-Prescott rosters.
The most commonly owned pairings are basically just the most commonly owned players
32% Jacory Croskey-Merritt + Emeka Egbuka (+6.2% over expected 26.2%)
27% Jacory Croskey-Merritt + Ricky Pearsall (+4.8% over expected 21.9%)
26% Emeka Egbuka + Ricky Pearsall (+5.5% over expected 20.9%)
22% Jacory Croskey-Merritt + Chase Brown (+3.2% over expected 18.9%)
These are also more common than expected - I guess there's an overall tendency to take the obvious highly-owned value plays vs. to avoid them.