I sort of just sit 'side saddle' and generally blow for about 3 hours.
No problems, no stiff neck. You kinda get used to it, I guess.
For sure you want the blower to be wider than your wheel tracks, that is a must.
I use a 60" and my wheels are 48" and that on a 19 hp CUT gear drive tranny.
(and we often get 16" dumpings), just take smaller bites, or if hydro drive , go slower but keep the RPMS up.