The MTR series of rigs are good performers. Personally, I tend use a linked dipole with 4m /12ft pole as a support. With about 2 to 3 watts out, the system works nicely in Europe. With the antenna so low, it’s easy to adjust links without lowering the antenna 
A tuner and end fed would work fine, but note that the PA is not robust when it comes to reactive loads. The 3B MTR has a built in protection system I believe that slowly ramps up the power output in ‘tune’ setting, but other rigs in the series do not. The Hamshop.cz tuner Stavebnice Altoids L Tuner | Hamshop.cz would seem to be ideal for an MTR.
The MTR-5B works well, using the 5B on 15m and 17m has provided DX contacts (>2000 miles) on every outing. The display adds a great deal of convenience.
One thing about the LNR Precision MTR that seems to be widely reported is that the power o/p is often low due to the PA inductors not being properly tweaked into their sweet spot.
73, Colin M1BUU