In normally, The UPS not suitable for supplied directly to Motor because The UPS capacity shall be cover Peak current.
As Motor Data
The UPS capacity recommend is (48.6Ax3) x 480VAC x 1.732 = 121.212kVA => Select 160kVA
About Dimension,
- Industrial grade (STATRON) is very big approx. 5,000 mm.
- Commercial grade (Eaton 9390 *transformerless*) refer attached file
Please consider above and select the UPS as your requirement after that I shall be sent All calculation and quotation to you.