You certainly may! You can ask us to leave your order without obtaining a signature (ie. in your mailbox or on your doorstep) but please ensure it is a safe spot that is not easily noticeable because if you do not receive your order, and the courier claims it was delivered, then you cannot make a claim on it and you will lose your purchase and payment.
The exception to this rule is for tobacco, herbal smoking blends, and vaping products. These products can only be sent with the signature required service and will not be delivered unless the courier driver has confirmed that the receiver is over 18.