No, no, no.
Textbook “right plant, wrong place.” Miscanthus sinensis is tough, drought tolerant, creates a nice screen, and if the late-blooming cultivars such as ‘Gracillimus’ and ‘Morning Light’ are selected, has little chance of seeding all over. After a few years in place, most cultivars are as wide (or wider) than they are tall. The lovely mounding/flowing habit is why this is the number one ornamental grass sold.
A better option – a very upright grass such as Calamagrostis x acutiflora ‘Karl Foerster.’ Regardless, this stuff needs to come out. Depending how long it’s been in the ground, a backhoe with probably be required. Or, they can continue carving it into a pillar.