I always try avoiding planting rails on floors. This is to future-proof things. Should floors need changing, no rail removal, tampering nor workaround needed.
If staircase & upper floors are of concrete, you can use chemical anchors(Hilti, Sika, Fischer) to plant metal angles or channels on the vertical sections(beam face or side of staircase) for your balusters to bolt on to. This method will have better pivot/movement resistance than floor-mounting.
Here's an example of rugged treated wood anchored on the vertical beam face, not thru the floor.
Tried looking for 1st hand stair application pics to share. It has been a while since we've done stair rails in wood. They were likely stored & lost in older phones.[emoji852]
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