Mark
This work includes deployment of the army in Ireland.
Impartial relation of the military operations which took place in Ireland: in consequence of the landing of a body of French troops, under General Humbert, in August, 1798. Hubert Taylor. T. Egerton 1799.
https://books.google.ca/books?id=7QgwAAAAMAAJ&pg=PA10&dq=
The monthly army list corrected to 1 March 1799 records the location/station of the army units. It also includes the military staff for Ireland.
https://books.google.ca/books?id=YLpTAAAAcAAJ&pg=PA45&dq=
Google books lists a copy correct to 1 June 1798, but no access online. The British Library or the National Army Museum might have copies?
See also
History of the Irish Rebellion in 1798: With Memoirs of the Union, and Emmett's Insurrection in 1803. William Hamilton Maxwell. George Bell and Sons 1877.
https://books.google.ca/books?id=J7VDAQAAMAAJ&pg=PA468&dq=
This work has some details of interest.
The British Armed Nation, 1793-1815. J. E. Cookson. Clarendon Press 1997 reprint.
Good Hunting.
Ron