It appears to me that with ML knitting you need to decide which is the RS and the WS, just to keep things oriented. Whichever will make no difference in the actual knitting.
With circ knitting the same applies. In both techniques, the growing tube of knitting ideally would be pointing downward, towards the floor, between the needles. You can invert the tube at any time without changing anything. Then your working row would be on the bottom of the tube and the tube would appear to be growing upwards.
Landolphe, who would find some way to knit placemats in the round