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nauls
lynx
Yeah you'll need a minimum number of teeth engaged to ensure it doesn't slip, it's commonly referred to as lap angle in drive systems and you can maths that if you have the inclination.
As @stevo_com has mentioned, you have to make some considerations where you place the tensioner - Ideally you want the length of belt either side of the tensioner pulley to be equal (referred to as the "span").
You can technically put the tensioner idler on either side of the belt but one side may be preferable to the depending on the span lengths and amount of slack you need to take up. I can't recall the specifics for a timing / toothed belt but that's certainly the case for other belts