I absolutely HATE chain tensioners myself...lol...lol...I figure that if they don't need them on motorcycles, then we don't need them on motorised bicycles either...I got rid of my tensioner many years ago when one of those suckers grenaded on me, I immediately took me and my bike home, (the walk of shame...lol.), and immediately took the drive shain and chopped it down to size for an exact fit, also had to take a link out of my pedal chain so it wasn't loose and hanging...lol.
Here is my bike with no tensioners at all just so you can see it is more than possible to do this.
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