There should be minimal risk of flystrike in an active, healthy rabbit. Keep their living area clean so that flies are not attracted there eg spot clean the toilet areas daily, full clean out weekly. Check the individual rabbit over twice a day, mainly round the bum. There should be no poo attached to them - this will attract flies and indicates that other action is needed - check for things like a better diet, more hay / fewer pellets, not overweight, able to groom properly (teeth OK, arthritis), etc.
Flystrike is an awful condition and very difficult to deal with effectively once the fly eggs have hatched. The rabbit may die from shock, even if all maggots have been removed.
Fly eggs should be removed immediately if found. They can hatch in a couple of hours in warm weather. This is where products like F10 come in. Spray the affected area with a few squirts as per the instructions - after the visible eggs have been removed. F10 can stop the eggs developing or kill the larvae. For an at-risk rabbit, it can be used as a protective measure before exposure to flies. A normal, healthy rabbit should not need routine chemical protection.
http://www.meadowsah.com/home/f10-treatment-products.html
F10 is toxic to cats - so make sure they have no contact with areas that may have been contaminated.