Looks like the engine is positioned like the old ones with the same spark plug and carburetor locations. If it has a battery, it would be best to remove it before standing so there won't be any chance of acid spilling out. I've never seen one of the newer mowers like that one and can't tell about the gas cap. There might be a problem of gas dripping from the gas cap if it has a vent that don't screw in to close like the older ones. Other than that, don't see any reason why it wouldn't work standing on it's end.
In both cases the mower should be tipped over on it's left hand side.
You alway tip an engine so that the cylinder is pointing up
Just curious, do you Snapper experts think I could install rear bumpers on a new style Snapper RER and stand it up on end to service the mower?
Thanks
New style RER without bumpers:
View attachment 32547View attachment 32548
Old style RER with bumpers:
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You might check your mowers paperwork/instruction manual and see if they offer a bumper kit? If no info there, you might check with the Snapper Customer Service Dept. to see if they offer a bumper kit as an accessory for your model? Are there holes already there that look like they might be for a bumper kit? If nothing comes up, a Snapper Model 3081S had bumpers that you could easily make work.