Are side mounted horizontal license plates legal on motorcycles in NH?

NH RSA Section Saf-C 3210.03 - Registration Plates

(a) The mechanic shall inspect the registration plates and reject the vehicle if it fails to meet any of the following:

(1) The registration plates shall be securely mounted on the exterior of the vehicle in the locations provided by the manufacturer. Vehicles which display special number plates pursuant to RSA 261:91 shall be inspected even though the registration certificate reflects a different number;