No, it is not acceptable for a food courier or any delivery person to enter your home without your knowledge or permission. Opening your front door and placing an order on the floor without your consent is a violation of your privacy and personal space. Delivery personnel are typically expected to hand the order to the recipient directly or leave it in a designated area specified by the customer, such as a doorstep or a delivery box.
If you have specific delivery instructions or preferences, such as leaving the order at your doorstep, it is advisable to communicate those instructions clearly when placing the order or to contact the delivery service to make the necessary arrangements. It is important to ensure that your delivery instructions align with your comfort level and that they are followed appropriately.