Recommended purchase – small 4channel power amplifier or 2x 2channel

Hello! Need a 2 Golf 4 doorr and want to upgrade with regard to sound. The utility value of the vehicle must not suffer therefore nothing comes into the trunk. I have been changing the car a few days ago. I bought a Helix Dark-Blue4 a few weeks ago which unfortunately does not fit where I want it to go. — I wanted to install it in the storage under the glove compartment. Unfortunately, it is too big. As an alternative I originally wanted it under the glove compartment. build a storage under the glove compartment in the passenger footroom – but for safety reasons I got away from it. —————–> Uses either 2 small 2channel power amplifiers or a small 4channel power amplifier that I can install inconspicuously — I don’t care about performance! It should only sound reasonably reasonable and be as small as possible. Maximum 20x20x5cm. Price: maximum 100-120€ I am grateful for all suggestions! cu