Plots on installments

I want to buy plot in islamabad/rawalpindi on installments. My budget is 15000-20000 per month.

Is e-16/4 safe option. As there are some adds for down payment 300,000 to 500,000 (which i can afford) and then the monthly installment.

If there is any other safe option (legal society) please tell me.

Park View City Islamabad is a new society adjacent to Bahria Enclave offering 5marla plots on installments. Bahria Orchad phase8 is also a good option.