it looks alrite to have them there.. at least it is not blocking the view of your fish.. so your fish still can be the centre of attraction.. if plants are in the middle, probably your plants become the main attraction..

anyway, it is a good idea to migrate to another bigger tank.. that tank indeed looks a bit small..
for future tank, probably you may consider hiding air stone or filters behind the fake plants.. this way, unsightly equipment will be kept out of sight and they also help to get rid of any debris collected at those corners..
cheers