Using water sensors in property

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Hi,

I just recently joined BiggerPockets and this is my first post. I have learned a lot reading through the different forum topics and now have a question of my own. I have a 4-plex that just had a water leak do to an overflow from the washer in an upstairs unit. There is significant damage to the upper and lower unit on one side and wanted to see if there were any suggestions for water monitoring/sensor systems that can be placed around the house and even in walls to monitor and alert you of moisture in those areas. Obviously it is too late for the current water leak but hoping to limit damage if something like this were to occur again. 

I have done some research online and found a few systems that can do this but wanted to ask for recommendations and see what advice there is for these kinds of water/moisture recognition systems. 

Thanks in advance for the help.