I recommend you do NOT ask your lender to IMPOUND your account for property taxes. This is because of three (3) primary reasons:
1) The lender usually will take about one-third more than is necessary to pay yor taxes. It keeps growing and growing in an escrow account that you do not have access to, until, usually, you refinance your mortgage.
2) You lose the use of your money for a temporary emergency.
3) You lose INTEREST on your own money, because you can probably make that money grow through other investments, such as a 3-month money market account or CD.
Unless you are irresponsible with your finances, and can't come up with a larger payment when the taxes are due, you should avoid escrow accounts and maintain CONTROL of YOUR money.