Hi guys! So I was really in love with the idea of doing a shallow glass bowl with floating candles and floating flowers, surrounded by votives kind of like this one (source):

I met with a florist yesterday and she pointed out that since these centerpieces would be so low, they'd be below all the wine glasses, water glasses, champagne flutes, etc, and so our guests wouldn't be able to see then until they were standing right over them. So when you look out over the room, you wouldn't be able to see any of the centerpieces. I hadn't even considered that, and now I'm really bummed out about it. Have any of you been to a wedding where centerpieces like this were used? Did it look underwhelming because they were hidden by all the glassware?
I'm cosidering buying some glass blocks like this from a hardware store and placing the bowls on them to elevate them a little more - does that seem like it might work?

Her suggestion was to do a few tall round vases with sunken orchid stems and then a candle floating on top that's about the size of the vase. She quoted me about $75 per table for that, which seems steep to me, but she said the cost comes from having to send a crew to do the installation the day of, instead of being able to assemble the flowers in advance and just having to send one person to put them on each table. Is that about what other people have paid?
Summary: Have you seen weddings with low floating centerpieces, and did it look nice or underwhelming? Do you think putting the bowl on the block to raise it up would work? If not, we'll probably go witht the orchids sunk in the tall cylinders, but can other brides give me an idea of what they paid for that?
Thanks for all the advice!