sump tamp or cannister filter

Hi all I have been thinking about installing a sump in a cabinet above my 36 gal (136 liter) tank. The surface it rests upon makes it virtually impossible to install a sump below but above is not at all impossible albeit with some mods. The tank currently runs a fluval 206 canister filter...

Hi ive had a aqua one 980 tank for few years tropical set up , im getting a 6 ft tank would a large sump tank be better then using large cannister external filter? or maybe both . My aqua filters trickle filter please help with thanks