<b>Bid floors: the lever most publishers leave flat</b>

<b>Bid floors: the lever most publishers leave flat</b>

What it does: sets a minimum CPM the auction will accept, per slot/geo/device. No floor = you accept any lowball; floor too high = unfilled inventory.

Setup effort: 3/5 — dynamic flooring tools (or your manager's UPR/optimized floors) tune this automatically; manual is fiddly.

RPM lift seen: moving from flat/no floors to optimized dynamic floors routinely adds +5 to +15%, mostly by stopping the race-to-the-bottom on high-demand impressions.

Pros
— Captures more of each impression's true value
— Dynamic floors adapt by geo/time without babysitting

Cons
— Set too high = no-fill = the collapse/CLS mess from earlier
— Bad manual floors can quietly lose more than they gain

Verdict: use optimized/dynamic floors, never a single flat number across all inventory. Lift: ★★★★☆ — Risk: ★★★☆☆
Best for: any programmatic seller above ~50k pageviews. Skip manual flooring — let a dynamic tool do it.