The Germans also tried this, specifically in the Henschel HS 130E. This aircraft used the HZ-Anlage, which used two DB603B engines (wing-mounted) that were supercharged by a DB605T engine mounted in the center of the fuselage.
http://www.airwar.ru/image/i/spyww2/hs130e-i.jpg
My source is the book "Warplanes of the Third Reich (Green) and this web page:
Translated version of http://www.airwar.ru/enc/spyww2/hs130e.html
tom