I have those speakers. I took a chance and bought them used about 4 months ago. They have a front port so I doubt you will have a placement problem. I’ve owned many speakers including other Harbeth models and these are outstanding.
If you take a look at my system you will see that they are placed about a foot from the rear wall with windows behind them. You should look for a used pair just in case they don’t work out.
BTW, make sure you get the correct size stands to match them. You should check all listings for a used pair before you spend over 8 grand new!
TMR has a pair listed here for $4000. Grab them!