If you are using the services of a professional hot tub installer, there should be no problems which need concern you other than accessibility and suitability of the location. If you are installing your hot tub indoors, possibly the biggest concern is the weight bearing of the floor. The average 4 person hot tub weights 2000 kilos when full of water, so if you have a wooden floor it is very likely it will require strengthening prior to installation. So in preparation for the hot tub it is always safer to get an inspection (survey) from a competent person.
The other minor concern might be access to an electric connection. Though many hot tubs now connect directly to a standard 13amp socket, it is always wise to connect via a dedicated circuit breaker.
Another consideration of an indoor location should be ventilation. A hot tub will release water vapour containing the hot tub chemicals, this may cause problems of condensation, leading to damp, and the inhalation of the chemicals. For these reasons it is advised you have adequate ventilation in the room via means of an extractor.