I have a bunch of 150-gallon stock tanks as well as a 18' (non-chemicalized) metal pool to catch and store irrigation water. Every spring i see some mosquito larvae at a certain point. Then a few days later, tadpoles. Then i never see larvae again for the year.
Also i have some very small seasonal ponds.
Every year i see so many different types of amphibian eggs. Large, small, loads of them. I've got tree frogs, toads, bullfrogs, salamanders, and probably more amphibs than i can recognize.
I get a lot more eggs in the ponds than the tanks, but still get a lot in the tanks.
So maybe get a big tank and park it under your eave (unless you have gutters in which case route the gutter into a tank).
Only problem is, if tank overflows in a rain, the tadpoles apparently go over the edge. I never see them again. They just disappear.
I am about to get a bunch of bigger tanks like this: http://i.ebayimg.com/images/i/351558896000-0-1/s-l1000.jpg
275 gallons. I can get 10 for $600 delivered; clean units. Figure i will saw the tops off of a bunch and place them on the back side of my bldgs to catch runoff.
If they are so tall that amphibs don't find the water, i can stock them with some of the gallons of eggs i get in my shallow ponds (I suck down the ponds in the spring to fill other large containers, which exposes impressive quantities of a variety of eggs).
Also i have seen vids of people sawing them in 1/2 to make 2 tubs for aquaponics. Seems one could make good turtle habitats that way.
And if i'm expecting a big rain when they are already pretty full, i can use a sump pump to draw off some water into other containers that still have tops on them.