The roads are very flat here so I don't have to worry about climbing mountains. So, no I haven't looked into a engine chip for my 5.
From the Mazda specs on Racechip's site it shows the 2.0 TDI engine in factory tune having 143 HP and 360 NM (265 lb-ft). Compared to my 2013 with a 2.5 gasoline engine, which is rated at 157 HP and 221 NM (163 lb-ft), the 2.0 TDI you are looking at already has 62% more torque than what my car is rated.
What is the power to weight ratio and the torque to weight ratio of the Dacia Logan that you have now? Will the Mazda 5 you are looking at have better power and torque ratios than the Dacia, before you have to "chip" it?