you can check the prepaid data offer in the Netherlands here:
http://prepaid-data-sim-card.wikia.com/wiki/Netherlands
Just stay away from *bliep as they are changing networks and it's unclear what happens in April.
For data on MVNOs Lycamobile (on KPN) is the best choice right now and SOME of their packages are on 4G/LTE (be aware: you need the 1800 MHz band for LTE at least). And strictly no tethering with Lycamobile!
Lebara is only on 2G/3G in the Netherlands up to know.
BTW. I'm a bit confused: You need 10 Mbps for Google Maps??? That's one of the few apps which already work on EDGE. For Google Maps you certainly don't need LTE.