From my experience, I can tell u that's not a necessary to buy odd lot.
1.) U have to pay more expense on buying odd lot (not worth)
2.) Not all the broker can let u buy odd lot from the market, especially bank.
3.) While u fixed that to 三手 400股 HSBC, does that mean anything to yourself?
When the first day 做月供股票, then u should already know that there would be odd lot on the shares, then why border to buy odd lot from the market.......