The phrase "allegedly placed" is correct and usable in written English.
It can be used when discussing something that is claimed or reported to have been put in a certain position or situation, but without definitive proof.
Example: "The documents were allegedly placed in the safe before the investigation began."
Alternatives: "reportedly positioned" or "supposedly located".
As a punishment, Sister Francesco allegedly placed the girl's hand on a hot plate used for cooking chapatis.
She allegedly placed the items in storage but allowed her bill to go unpaid, and her father's work wound up at auction.
A suspect, identified only by his family name Wang, allegedly placed traps after he found his sheep had been killed by wild animals in December.
Children's cereals weren't just allegedly placed half as high up the supermarket shelves as adult breakfast food, in the ideal spot for attracting youthful attention.
The group allegedly placed hidden "shells" or "back doors" within the hacked networks, which allowed them to return at a later date and steal confidential data.
Tsarnaev and his brother allegedly placed the bombs on the ground, near the finish line, so there were a lot of amputations.
Ricci, 74, is the first of around 50 wealthy French nationals being pursued in the courts for allegedly placing money in Switzerland to avoid taxes.
Last week he was also charged with allegedly placing 44 bets on football matches between July and September, in contravention of the Scottish Football Association's rules on gambling.
Burnley may decide not to re-sign Joey Barton after it was revealed the midfielder is facing a hefty fine and suspension having been charged by the Football Association for misconduct after allegedly placing 1,260 bets over a 10-year period.
BamBrogan separately filed a restraining order against Pishevar for allegedly placing a hangman's noose on BamBrogan's chair after a disagreement.
The statement continued: "By allegedly placing multiple, simultaneous, large-volume sell orders at different price points - a technique known as 'layering' - Sarao created the appearance of substantial supply in the market".
