I will follow this advice for my next router. But, the OP is splitting the cost with their landlord. I just assumed that it's likely there will always be walls in the way and low reception. And, the OP will have to convince the landlord to pay the premium for something the OP won't benefit from. I have no idea if the relationship with the landlord is such a long-term one that the 6e will ever be relevant.
I guess neither of us should advise the OP one way or the other regarding future requirements. My advice was based on unstated assumptions - quite possibly wrong ones.