No. Yet again, the ball is on your court. This all goes down to what you deem best. Feel free to install both if you, for the longest time, have believed that sheers and curtains belong together. However, if you like them separately installed, no one will question your choice. After all, it is your house, and everything runs by you. If you love your curtains hang alone, there are curtains made just for you. for example, those made with block-out fabrics to hinder the entry of sunlight and UV rays, among others.