A clean, level and secure floor or foundation is mandatory. The use of a housekeeping pad is ideal. Correct anchoring assures compliance with seismic requirements.
The correct environment is mandatory. A refrigerated dryer demands an ambient temperature of no more than 100 degrees F (37.8 C) to provide the design dew point. Any temperature above this will derate the dryer.
Local building codes demand use of the correct wire size, fused disconnect and breaker. Codes also control location of the disconnect.
Hiring a properly licensed contractor will assure compliance with local codes as well as good standards and practices.