The phrase "are predominantly placed" is correct and usable in written English.
It can be used to describe the primary location or arrangement of items or elements within a certain context.
Example: "The books are predominantly placed on the top shelf, making them easily accessible for readers."
Alternatives: "are mainly located" or "are primarily situated".
The working class are still hugely underrepresented, as are people of colour, and the focus is predominantly placed upon mood disorders – which are important, of course, but represent only a proportion of the mental health issues that affect the general population.
Similar to the rodent stroke model, these cells remained for several weeks and were predominantly placed in the peri-infarct zone.
These are predominantly planned and prespecified activities which take place in colleges, universities, and schools.
For this reason, seeds of fleshy-fruited plant species are predominantly deposited in these places.
Older gravestones in the cemetery are generally cut from limestone, and the gravestones placed after 1900 are predominantly made of polished granite.
In particular, the state's most crowded areas saw something of a black exodus from 2000 to 2010; the total population dropped 11.2 percent in Irvington and 8 percent in East Orange, both places that are predominantly black.
It's also interesting, given the relationship to the material of the show's creator and writer, Sally Wainwright, that the couple's grown daughters — wonderfully played by Nicola Walker and Sarah Lancashire — have their hearts in the right place but are predominantly painted as uptight, frazzled worrywarts.
Davidson (2016), for example, found that many past studies cited and used theoretical models that are predominantly Western for CSR research in places such as India and China.
All of the places on the unromantic list – Bradford, Newport, Blackpool – are predominantly working-class.
Tamils are predominantly Hindu.
