It's probably not an ideal solution, however, quite a few people do implementations such as this for the very same reasons - space. When you don't really have a choice, then it just has to be ! One benefit is the quick access to milk..........but.........there are a few issues you will need to carefully manage. Typically, many places have a small fridge underneath or to the side. The #1 issue you need to be constantly managing is espresso machine drain hoses - they need to be as short and as vertical as possible. You would be surprised how quickly they clog and it's always in the middle of a busy serving period - which can be embarrassing as your customers tend to spot the problem before you do and typically by the time you see it, it's too late. Elevating the machine means it can start to reduce the ergonomics for height-challenged operators - but other than that there may be no other really issues with elevating equipment other than the unsightly electrical, water and drainage connections. Of course, you will need to ensure the design takes into consideration the correct operating conditions require for the fridges, e.g. surrounding area airflow, heat exchange and dissipation factors, etc.
