It is important to invest in the right image of Maa Laxmi for your home. For instance - an image or her standing must not be placed in the house. Keeping her image in this form makes her restless and forces her to leave your home. Whenever her image is placed, it must face the North direction.
It is a good idea to keep a metal idol of her. Never invest in a plastic idol for your home. Similarly, it is best to avoid any fragmented idol where her face is not visible.
It is best to keep Charan Paduka of Goddess Laxmi on the entrance of the home. This must face your pooja room entrance.