If you can get it to push your chain upwards, so it's compact with the chainstay and increases chainwrap around the sprocket, you should be fine.
I've still got the spring from one of these to swap the tension direction.
Dewit!
Edit:
I did a similar thing with one of the cheap, rattly, 10buck jobbies. Took the spring out and just zip-tied the fucker to the chainstay. Worked fine for Polo. Removing the rear wheel proved quite a mess though.
@hippy started
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If you can get it to push your chain upwards, so it's compact with the chainstay and increases chainwrap around the sprocket, you should be fine.