Middle connection radiators suitable for dry wall?

[preludecrazy]

I'm about to replace some radiators in my house. As shown in the attached photo, the radiators are plumbed with plastic pipes which poke through dry walls. My thinking is, perhaps the plastic pipes could be hidden better with middle connection radiators, opposed my existing radiators where the connections are at either ends. Will this be a straight forward task for a plumber, or is it tricky, e.g. regarding connections/joints?

Thanks.