The higher the position the harder it is to compensate for roll in rougher seas though. Would expect a laser to be mounted about where the test ships have it, below bridge height on most ships.Power consumption is less of an issue, considering how "overpowered" 055 is, in any case a 300kW laser is not going add a lot more burden to a 4X28MW ship.
Space though is an issue. IMO only when lasers are considered to be superior to CIWS will we start to see lasers on board replacing things like 1130.
Another possibility is perhaps redesigning the integrated mast to leave room for lasers system, this would be the optimal solution giving laser turret the topmost position with clear los and better range against sea skimmers