the 30" push mower is $1,900 "show price" I just looked at it yesterday and today at the GIE. is it worth that? I don't know, I can throw a lite weight 21" push mower on a trailer for those odd spaces, and cost way less. I can also have two, 36" walkbehinds on a trailer. you get a nice used 36" walkbehind for $1,900, and get a piece of equipment with a lot more productivity capabilities.
as for that slope I'm with carsaw I'd put a 61' ZTR on it, most likely we'd use walkbehinds on that entire yard.