The G2724D sales site does not show any Soundbars which means we do not offer one.

The best and the only one worth buying is the AE515m (eBay ). 
it is an amazing soundbar. Won’t be disappointed with the sound. 

however your stand is a weird shape, so it’s  not going to correctly fit. 
try glue/cutting/rubber bands. 

alternatively you could try a second hand monitor stand. 

eg for P2719

the number 27 is the size of monitor for which weight is a factor

19 is the year. This is important for the soundbar mount to fit

I can’t be certain it will clip to your monitor