I would not want my account left logged in at a rental property for strangers to use.
Assuming the primary goal is voice commands not keeping my place in Audible or my shopping list while I'm at the vacation home, I'd make a separate Amazon account and assign all the vacation Echoes to it.
That way commands like "Turn on the living room light" will make sense in their context, being at the main house or vacation house.
And guests won't find some loophole to spending my money or jacking the settings of my personal account.