They won’t differentiate.
If that type of product is usually hard wired, that’s how they’ll price it and treat them all the same way. They won’t break it down by models individually. It’s too complex and too confusing for customers as well as staff probably and will lead to accusations worse as why does it cost £40 to install one model from HP and £90 for another, then they get accused of ripping off another way.
No win situation so, go with the worst case.
K.