Lemar would be a terrific signing, too many wooden legs in our squad and he'd rectify that ratio. In the first half of last season before Mbappé exploded he was Monaco's best player, decided many games by himself and I'd also say he's chiefly responsible for reviving Falcao's career.
Not sure where we'd play him though. The idea of playing him at LWB because he's left footed makes as much sense as putting Giroud in goal because he's tall and has hands. He'd need a free role on the wing like Nasri used to in 10/11, in our 3-4-2-1 it'd make sense to play him in the front three but that makes Özil a bit redundant imo.
Anyway I'd get him first then worry about where to play him later