Every time a scroll past this fan posting, I just think yuk, it really is awful and I don't often say that, usually I think isn't great everyone has different tastes ..but that abomination goes nowhere

Here's a couple of links: https://www.designerchandelier.com.au/ Owner Jon Warren - recently got a Linkedin message, might be a good one too https://www.chicchandeliers.com.au/ 

Hi Shubha. Try Alti lighting in Claremont. You could also try Lightingales not far from them also in Claremont. Cheers

I wouldn't add any niches for decorative items as they are a bit dated, look a bit busy, and are hard to find anything that is shallow enough and tall enough to look any good. They were common in project homes of the 1990's but are well past their use-by date. You haven't mentioned the size of your chandeliers, however with the height of your ceilings they can't be too low. I would suggest hanging one over the centre of the dining table so that when seated the chandelier does not interrupt your line of sight across the table. This will allow for a decent size chandelier that you won't walk into. The second one I would add to the corner of the upstairs rumpus room , directly above the corner table in the plan. This will illuminate the stairs, but still be easy to access to change bulbs. It can be a similar height to the one in the dining room and its location will mean that people won't walk into it. Don't hang your chandelier above your stairwell as they do need maintenance for regular cleaning and changing bulbs, and they are hard to reach over stairs. Don't hang your chandeleir in the front living room as it is an unusual informal shape with the integration of the entrance hall and it will always look off-centre. Best of luck Dr Retro of Dr Retro House Calls