90W AC Vibration Motor, 3 Phase, 2 Pole

Once again, thank you very much for your cooperation.
The actual plate of the bottom sieve is not able to support the motor, as it has a thickness around 2 mm and a width around 50 mm. We are planning to reinforce it with a new plate able to support the motor and its vibration.
Since we will apply a new plate to support/assemble the motor, there will be no problem concerning this. My doubt is if we need to assemble the motor with:
• The longitudinal axe of the motor aligned with the direction of the product flow
or
• The longitudinal axe of the motor 90 degrees with the direction of the product flow?
Concerning the rotation of the motor, since we have a 100 W, 2-poles motor for other application, we can assemble it provisory and as we have a variable frequency drive, and we can check witch rotation has better performance (3000 or 1500 RPM) before order the new motor.
I suppose that these motors can be operated under a variable frequency drive. Please confirm if I am right.
After this confirmation, we are able to buy the right motor.

After receiving the 90W vibration motor, the customer service was very patient and professional to guide me to install it. The vibrator is very smooth to use, and it works well with my machine. I will continue to buy it next time.