The buying is at halt due to circuit lock in and not due to caping rule.
You can place an order but it won't get executed as there is no one to sell right now, and even if the circuit opens, your bid has to be extremely lucky to go through to get executed, given FIFO method further diminishes the possibility of it getting executed, so chances are less.
If you wish, you can keep trying to buy at 9 am to see if it gets executed.
@sauryadav