Assuming its the nose you want to keep down, and not the noise, then yes.
The distillation of views expressed elsewhere on this forum are that if you are over a certain length (6.5m?), trim tabs are a jolly good idea.
However, it might be wise to study the subject a bit more.
a) trim tabs do other things than just keeping your nose down, and
b) if your nose is up at low speed (too much!), this may be caused by something that could be cured by other means, like shifting some weight forwards, for example.
PS If you do decide you want to fit them, look at Bennett Trim Tabs.