I knew the 8th gen was smaller, but didn't realise you'd struggle to get a washing machine in! Sure you can, I mean I've put a washing machine in my Mum's Fabia with the seats down.
I've put a washing machine in the boot of my mk2 Golf before, I'd hope that the 8th gen Accord Tourer is a more capable load Luger than my beat up old Golf :lol:
Having just had a similar quandary over a chest of drawers, I'll be carrying this on my phone for future reference. It's very rough and ready as every surface curves and tapers making definitive measurement tricky. If nothing else it'll make deciding between "piece of cake", "no chance" and "possibly if the child seats come out" a bit easier.
P.S. Based on this I reckon you might just about get a 60x60x82 washing machine in on its back. Owing to the (rubbish) curve of the boot you might have to drop the rear seat if you want the lid to close fully.