What is your risk of a major flooding event.
Lets look at what could cause that.
1. You could hit something. At 7 knots what is the realistic chance of putting a big hole in your boat? I do not know but I don't think this is a high risk. I assume you carry plugs, and other emergency repair stuff onboard and since you'd know you hit something you could attend to the problem quickly.
2. you could have a seacock, hose or other failure of an onboard system. Personally I think this is your bigger risk. Things like washdown and head lines, engine hoses etc... can fail.
Addressing this kind of failure is really dependant on your knowing about it. Do you have a high bilge water alarm? If not, you should. Something on a separate float switch a couple inches higher than your normal bilge pump.
If you don't find out about high bilge water you can easily and quickly get to a point where the water is too deep to figure out what happened and fix it. If you know you're taking on water you can generally solve the problem.
If you know your boat is being flooded I assume you have seacocks that actually work? I also assume you have a set of plugs, and or one of those foam emergency plugs you can use?
So...
My method is warning. I have two high bilge water alarms. One forward and one aft of my engine rooms watertight bulkhead. These alarms go to a loud buzzer. They also go to my boats alarm system and I get a text within seconds if I'm not on the boat. I test these alarms frequently.
To mitigate a flooding event i have a set of wooden plugs, and one of those foam emergency plugs under the settee where I can get to them quickly.
I do not have yet but am going to add this season a stainless steel sump pump like the one I posted a photo of above. This pump or one like it will move 45 gallons per minute at a 5 foot lift. It has an AC motor that I'll wire to a dedicated circuit. Then, in an emergency all someone has to do is turn on the switch. If I'm not on the boat I can make one call to the harbor and within a couple of minutes someone can be on my boat and my pump can be running. No that pump at 45 gallons per minute is not the end all do all. Its job is to buy me time. Time to solve the problem. If I cant solve the problem time to calmly deploy my liferaft and call for help.